Python Design Patterns (2nd Edition)

Name: Python Design Patterns (2nd Edition)
ISBN: 9787115458803

Chetan GiridharPosts & Telecom Press2017

3.3

Word count: 186K words
Chapters: 11
ISBN: 9787115458803

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Summary

Design patterns are among the most powerful methods for building large software systems, and optimizing software architecture and design has become an important topic in the process of software development and maintenance. This book is the Chinese translation of Packt's Learning Python Design Patterns, second edition. Centered on the characteristics of Python as a dynamic language, it uses 11 chapters to systematically explain how design patterns are implemented in Python: starting from basic object-oriented concepts and design principles such as the open-closed principle, inversion of control, and interface segregation, it then covers patterns including singleton, factory, facade, proxy, observer, command, template method, and state, uses model-view-controller (MVC) as an example to show how composite patterns are combined, and finally discusses anti-patterns, introducing common software development and architecture traps such as "spaghetti code," "golden hammer," and "lava flow." The book includes example code based on Python 3.5 to help readers understand the problem each pattern solves, the roles of its participants, and the key points of implementation, while also analyzing the applicability, advantages, and disadvantages of each pattern in a dynamic language environment. Concise in length, it is suitable as an introductory read for developers who already know how to write Python and want to systematically build up their design thinking and architectural foundations.

Editor's review

市面上讲解设计模式的书不少，但大多以 Java、C++ 等静态语言为例，照搬到 Python 里往往显得笨重。这本小书的价值恰恰在于，它始终站在 Python 的视角谈模式：元类、一等函数、鸭子类型这些语言特性如何让单例、工厂、观察者等模式写得更轻，哪里可以简化，哪里反而要克制。全书只有 11 章、118 页，节奏紧凑，每章按“定义—UML 与参与者—现实世界示例—优缺点—小结”的结构推进，读完一个模式就能在脑中形成“什么场景用它”的判断。第 9 章以 MVC 串起复合模式，第 11 章的反模式部分更难得地提醒读者：识别坏设计比套用模式同样重要。它不是手册式的模式大全（比如未覆盖全部 GoF 模式），但作为一本低成本、高信息密度的入门与复盘读物，适合放在手边常翻。

Who it's for

A good fit for

已经掌握 Python 基础语法、想系统学习设计模式的开发者
需要为中小型项目做架构设计、希望提升代码复用性的工程师
从 Java 等静态语言转 Python、想了解模式在动态语言中如何变形的读者
准备面试、需要梳理面向对象设计原则与常见模式的技术求职者

Not a good fit for

完全没有编程基础、尚未写过一个完整 Python 程序的初学者
希望查阅全部 GoF 23 种模式并作为工具书随时检索的读者
只想找可直接复制粘贴的生产级框架代码而非理解原理的读者

Reading tips

先读第 1 章的设计原则，再按创建型、结构型、行为型分组阅读后续章节，形成体系。
每读完一个模式，用自己项目里的真实场景重写一遍示例代码，比抄书更有效。
读到第 11 章时，对照前面学过的模式回看自己写过的代码，找出其中的反模式。
本书篇幅短，宜快读一遍再精读重点章节，并配合《设计模式》原著补充静态语言视角。

About the publisher

Posts & Telecom Press China · Founded in 1953

Posts & Telecom Press is known for its strengths in science and technology, computing, and information and communications titles, and has extended its publishing into photography, art, software learning, and inspirational growth, giving it a fairly diverse range. Its catalog includes computing and communications works such as Refactoring and Patterns (Revised Edition) and Huawei Switch Learning Guide (Second Edition), alongside bilingual collector's editions such as The Little Prince (Chinese-English-French illustrated collector's edition), The Great Gatsby, and Three Days to See. Beijing Ten Years: 1980-1990 and Ghost Blade: WLOP Personal Illustration Collection reflect its presence in photography and art. Its authors include Antoine de Saint-Exupéry, Helen Keller, Joshua Kerievsky, Wang Da, Zhang Zhaozeng, and WLOP.

Chapter 1 Introduction to Design Patterns
Chapter 2 The Singleton Design Pattern
Chapter 3 The Factory Pattern: Building a Factory for Creating Objects
Chapter 4 The Facade Pattern: Adapting to the Facade
Chapter 5 The Proxy Pattern: Controlling Access to Objects
Chapter 6 The Observer Pattern: Keeping Track of Object State
Chapter 7 The Command Pattern: Encapsulating Invocation
Chapter 8 The Template Method Pattern: Encapsulating Algorithms
Chapter 9 Model-View-Controller: A Composite Pattern
Chapter 10 The State Design Pattern
Chapter 11 Anti-Patterns

FAQ

这本书是第几版？依据哪个英文原版翻译？

中文版为人民邮电出版社 2017 年 8 月出版的第 1 版（书名标注“第2版”），据 Packt 出版社 2016 年的《Learning Python Design Patterns》第二版译出，译者韩波。

书中示例代码基于哪个 Python 版本？

英文原版示例基于 Python 3.5，中文版沿用了这些示例，因此阅读时使用 Python 3.5 及以上版本运行基本不会有问题。

这本书讲了全部 23 种设计模式吗？

没有。全书 11 章重点讲了单例、工厂、门面、代理、观察者、命令、模板方法、状态等模式，并用 MVC 展示复合模式，另有反模式一章，并非完整的 GoF 23 模式大全。

118 页这么薄，内容会不会太浅？

本书定位是精炼入门，重在讲清每个模式解决什么问题、如何在 Python 中实现与取舍，深度有限但对建立整体框架很有效；需要更深入可搭配《Head First 设计模式》或 GoF 原著。

零基础能读懂吗？

建议先具备类、继承、多态等面向对象基础和一定 Python 实践，否则书中 UML 类图与模式动机部分会比较吃力。

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